赵月辉 / fastgpt-migrated

* feat(vectordb): add OceanBase HNSW quantization (HNSW_SQ/HNSW_BQ) (#6348)

Support OceanBase vector index quantization via VECTOR_VQ_LEVEL:
- 32 (default): hnsw + inner_product
- 8: hnsw_sq + inner_product (2-3x memory savings)
- 1: hnsw_bq + cosine (~15x memory savings)

HNSW_BQ requires cosine distance per OceanBase docs.
Tested on OceanBase 4.3.5.5 (BP5).

Closes #6202

* feat: add test inclusion for vectorDB tests in vitest configuration (#6358)

* feat: add test inclusion for vectorDB tests in vitest configuration

* refactor: update vectorDB README and setup for environment configuration

- Enhanced README to clarify the use of factory pattern for vectorDB integration tests.
- Updated instructions for setting up environment variables from a local file.
- Removed obsolete PG integration test file and adjusted test execution instructions.
- Improved structure explanation for shared test data and factory functions.

* perf: integrationTest

* feat: vector integration

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Co-authored-by: ZHANG Yixin <hi.yixinz@gmail.com>
Co-authored-by: Jingchao <alswlx@gmail.com>